冷拉拔对单晶Cu晶粒取向及断裂机理的影响

华云筱; 宋克兴; 何季麟; 皇涛; 周延军; 封存利; 丁雨田; 刘海涛; 胡勇; 曹军; 张朝民; 程楚

doi:10.15980/j.tzzz.2020.12.027

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冷拉拔对单晶Cu晶粒取向及断裂机理的影响
Effects of Cold Drawing on Grain Orientation and Fracture Mechanism of Single Crystal Copper
2020年40卷第12期页码：1436-1440
纸质出版日期： 2020 ，
DOI： 10.15980/j.tzzz.2020.12.027

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[1]华云筱,宋克兴,何季麟,皇涛,周延军,封存利,丁雨田,刘海涛,胡勇,曹军,张朝民,程楚.冷拉拔对单晶Cu晶粒取向及断裂机理的影响[J].特种铸造及有色合金,2020,40(12):1436-1440.

Hua Yunxiao, Song Kexing, He Jilin, et al. Effects of Cold Drawing on Grain Orientation and Fracture Mechanism of Single Crystal Copper[J]. Special Casting & Nonferrous Alloys, 2020,40(12):1436-1440.
[1]华云筱,宋克兴,何季麟,皇涛,周延军,封存利,丁雨田,刘海涛,胡勇,曹军,张朝民,程楚.冷拉拔对单晶Cu晶粒取向及断裂机理的影响[J].特种铸造及有色合金,2020,40(12):1436-1440. DOI： 10.15980/j.tzzz.2020.12.027.

Hua Yunxiao, Song Kexing, He Jilin, et al. Effects of Cold Drawing on Grain Orientation and Fracture Mechanism of Single Crystal Copper[J]. Special Casting & Nonferrous Alloys, 2020,40(12):1436-1440. DOI： 10.15980/j.tzzz.2020.12.027.

摘要

采用自制的热型水平连铸设备制备出?16 mm的铸态单晶Cu杆坯

并对其进行单道次冷拉拔加工制备出?12 mm的拉拔态杆坯。借助XRD、SEM等分析手段

结合室温拉伸试验

研究了冷拉拔对单晶Cu晶粒取向及断裂机理的影响。结果表明

拉拔前后单晶Cu横截面晶粒取向明显改变

织构组分增多

纵截面织构组分不变但体积分数发生变化。冷拉拔对单晶Cu断裂机理影响显著

铸态单晶Cu为微孔-韧窝聚集型断裂

拉拔态Cu试样为微孔长大型断裂。

Abstract

The as-cast single crystal copper bar billet with ?16 mm was prepared by self-made heated mold horizontal continuous casting equipment

and the as-drawn bar billet with ?12 mm was produced by single-pass cold drawing. The effects of cold drawing on grain orientation and fracture mechanism of single crystal copper were investigated by means of XRD

SEM

combined with tensile tests at room temperature.The results reveal that the cross-section grain orientation of single crystal copper is changed obviously after drawing

exhibiting the increased texture component. The longitudinal-section texture component is remained. However

the volume fraction is varied. The cold drawing has significant influence on the fracture mechanism

which presents as a micropore-dimple aggregation fracture for as-cast specimens

while presents as a micropore growth fracture for as-drawn specimens.